Property and Equipment (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment
Capitalized Interest	$ 43,000	$ 85,000	$ 54,000
Unfunded ConstructionAnd Equipment Purchases	1,076,000
Depreciation Expense	$ 30,072,000	$ 26,068,000	$ 25,279,000